2025/03/04(Tue) 14:30 -17:00 視訊會議室(圖書館) 3F, Video Conference Room(Library)
Title
A neuromorphic view on the computation and representation of image in the retinal circuit
Speaker
Dr. Tetsuya Yagi (Global Center for Medical Engineering and Informatics, Osaka University)Abstract
In the vertebrate retina, ambient images are continuously transduced into graded voltage responses in the photoreceptor cell array and then processed with electrochemical properties of the neuronal circuits. The images represented with graded voltages are further transformed into spatio-temporally distributed action potentials in the ganglion cell array which communicate with the visual cortex in parallel. Previous physiological and anatomical experiments have unveiled fundamental response features and relevant synaptic connections in major types of retinal neurons. Most of these physiological observations have been obtained from retinas isolated from animal eyes using simplified optical stimulations, e.g. spot of light, randomly modulated checker patters and so on. Accordingly, the function of the retina was often interpreted in terms of the receptive fields, i.e., center-surround antagonistic structure. However, recent physiological studies demonstrated new aspects of response properties in the retinal ganglion cells that are considered to be important to understand the retinal function. In my talk, I will first review these streams of retinal study. And then I will demonstrate several lines of the new aspect focusing on the dynamical computation and representation of visual information revealed in recent physiological experiments as well as dynamic simulations with a neuromorphic retina model developed in our group. These lines of aspects are thought to be critical and inspiring to develop novel event-driven vision sensor and image communication system.
Language
演講語言 (Language): in English